I was thinking about that when I was dropping my 6 year old off at some hobbies earlier - it’s pretty much expected to have learned how to ride a bicycle before starting school, and it massively expands the area you can go to by yourself. When she went to school by bicycle she can easily make a detour via a shop to spend some pocket money before coming home, while by foot that’d be rather time consuming.
Quite a lot of friends from outside of Europe either can’t ride a bicycle, or were learning it as adult after moving here, though.
edit: the high number of replies mentioning “swimming” made me realize that I had that filed as a basic skill pretty much everybody has - probably due to swimming lessons being a mandatory part of school education here.
This right here is a big one. I live in a college town in Minnesota and the students from out of state are absolute mennaces on the road in winter. My dad used to plow snow for one of the local universities. He had multiple students drive directly head on into his plow because they never cleared off any of their windshield before they started driving down the road. Luckily the snow plow tends to handily win in those situations and the plow trucks all had dash cams for exactly that reason.
You also get the people who think they’re invincible in the snow because they’re driving a 4 wheel drive truck. Newsflash, 4 wheel drive doesn’t mean you stop any better and it doesn’t do much when you’re on glare ice.
Similarly people who haven’t dealt with snow have no idea what to do when they do start sliding. So many people will just hit the brakes when they start to slide, which anyone who is familiar with winter driving should know that is the exact thing you never want to do.
Snow tires are another big one. I drive a tiny crappy rear wheel drive pickup but as long as I have a good set of snow tires on it and a few sand bags in the bed of the truck, then it still out performs any other vehicle with all weather tires in the snow.
I live in a ski town that caters to the Los Angeles crowd, and I feel you on all that. 4 wheel drive does not mean 4 wheel stop lol. We are lucky in that we don’t get that permafrost y’all get up north, usually the roads dry out a few days after a snow storm so snow tires aren’t mandatory up here. But the number of overconfident goofballs in the winter is way too high.
The big one I can think of are snow rated tires, most people have plain old radials that don’t do squat in snow. And then you have people that don’t know which axle is their drive axle and that’s always fun to watch. Thankfully I have a two door wrangler with all terrains that is a breeze to drive in snow, very rarely do I have to chain up.